Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.77.0 to 0.78.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.77.0...v0.78.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>